Sanyo XS1852 Precautions during Brazing, Connecting Tubing between Indoor and Outdoor Units

7-4. Precautions during Brazing

●Replace air inside the tube with nitrogen gas to prevent copper oxide film from forming during the brazing process.

●Do not allow the tubing to get too hot during the brazing process.

The nitrogen gas inside the tubing may overheat, causing refrigerant system valves to become damaged. Therefore allow the tubing to cool be- tween brazings.

7-5. Connecting Tubing between Indoor and Outdoor Units

(1)Tightly connect the indoor side refrigerant tubing with the outdoor side tubing. (Fig. 7-6)

(2)To fasten the flare nuts, apply specified torque as:

Table 7-1

Tube Dia.	Tightening Torque
1/4" (6.35 mm)	Approx. 140 — 180 kg-cm
	(120 — 160 Ibs-in.)
5/8" (15.88 mm)	Approx. 680 — 820 kg-cm
	(590 — 710 lbs-in.)

Torque wrench

Spanner

Indoor unit

Outdoor unit

0131_C_I

Fig. 7-6

Refrigerant tubing

Seal (supplied)

	Insulation tape (white)
	(supplied)
	Flare insulator (supplied)
Unit side	Tube insulator
	(not supplied)
insulator
Flare nut	Vinyl clamps (supplied)
	1015_X_I

Fig. 7-7

7-6. Insulating the Refrigerant Tubing

Always insulate tubes after

CAUTION completing leak tests on all connection points.

Important

To avoid condensation and water leaks, the wide and narrow tubes must be insulated with the supplied insulation materials.

Taping the flare nuts

Wind white insulation tape around the flare nuts at the wide and narrow tube connections. Place the seal (supplied) on the unit. Then cover up the tubing connections with the flare nut insulator, and cover the gap at the union with the supplied black insulation tape. Finally, fix the insulator at both ends with vinyl clamps. (Fig. 7-7)

Insulation material

The material used for insulation must have good insuIation characteristics, be easy to use, be age resistant, and must not easily absorb moisture.

After a tube has been insu-

CAUTION lated, never try to bend it because it can cause the tube to break or crack.

	Refrigerant tubing and insulator
Drain insulator	(not supplied)
	Drain pipe and insulator
and clamp.
Large	(not supplied)
(supplied)
Packing
clamp.	Insulation
Small	tape
hose band	Vinyl
(supplied)
	Flare clamp
	insulator
	Seal

0558_X_I

Never grasp the drain or refrigerant connecting outlets when moving the unit.

Fig. 7-8

22S4359128